1 /* $OpenBSD: tcpdrop.c,v 1.4 2004/05/22 23:55:22 deraadt Exp $ */
4 * Copyright (c) 2009 Juli Mallett <jmallett@FreeBSD.org>
5 * Copyright (c) 2004 Markus Friedl <markus@openbsd.org>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include <sys/cdefs.h>
21 __FBSDID("$FreeBSD$");
23 #include <sys/param.h>
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <sys/socketvar.h>
27 #include <sys/sysctl.h>
29 #include <netinet/in.h>
30 #include <netinet/in_pcb.h>
32 #include <netinet/tcp_fsm.h>
33 #include <netinet/tcp_var.h>
43 #define TCPDROP_FOREIGN 0
44 #define TCPDROP_LOCAL 1
50 char hs_host[NI_MAXHOST];
51 char hs_service[NI_MAXSERV];
54 static bool tcpswitch_list_commands = false;
56 static char *findport(const char *);
57 static struct xinpgen *getxpcblist(const char *);
58 static void sockinfo(const struct sockaddr *, struct host_service *);
59 static bool tcpswitch(const struct sockaddr *, const struct sockaddr *, int);
60 static bool tcpswitchall(const char *, int);
61 static bool tcpswitchbyname(const char *, const char *, const char *,
63 static bool tcpswitchconn(const struct in_conninfo *, int);
64 static void usage(void);
67 * Switch a tcp connection.
70 main(int argc, char *argv[])
72 char stack[TCP_FUNCTION_NAME_LEN_MAX];
74 bool switchall, switchallstack;
78 switchallstack = false;
82 while ((ch = getopt(argc, argv, "ailS:s")) != -1) {
91 tcpswitch_list_commands = true;
94 switchallstack = true;
95 strlcpy(stack, optarg, sizeof(stack));
107 if (switchall && switchallstack)
109 if (switchall || switchallstack) {
112 if (!tcpswitchall(stack, mode))
117 if ((argc != 2 && argc != 4) || tcpswitch_list_commands)
121 lport = findport(argv[0]);
122 fport = findport(argv[1]);
123 if (lport == NULL || lport[1] == '\0' || fport == NULL ||
128 if (!tcpswitchbyname(argv[0], lport, argv[1], fport, mode))
130 } else if (!tcpswitchbyname(argv[0], argv[1], argv[2], argv[3], mode))
137 findport(const char *arg)
141 /* A strrspn() or strrpbrk() would be nice. */
142 dot = strrchr(arg, '.');
143 colon = strrchr(arg, ':');
154 static struct xinpgen *
155 getxpcblist(const char *name)
157 struct xinpgen *xinp;
162 rv = sysctlbyname(name, NULL, &len, NULL, 0);
164 err(1, "sysctlbyname %s", name);
167 errx(1, "%s is empty", name);
171 errx(1, "malloc failed");
173 rv = sysctlbyname(name, xinp, &len, NULL, 0);
175 err(1, "sysctlbyname %s", name);
181 sockinfo(const struct sockaddr *sa, struct host_service *hs)
183 static const int flags = NI_NUMERICHOST | NI_NUMERICSERV;
186 rv = getnameinfo(sa, sa->sa_len, hs->hs_host, sizeof hs->hs_host,
187 hs->hs_service, sizeof hs->hs_service, flags);
189 err(1, "getnameinfo");
193 tcpswitch(const struct sockaddr *lsa, const struct sockaddr *fsa, int mode)
195 struct host_service local, foreign;
196 struct sockaddr_storage addrs[2];
199 memcpy(&addrs[TCPDROP_FOREIGN], fsa, fsa->sa_len);
200 memcpy(&addrs[TCPDROP_LOCAL], lsa, lsa->sa_len);
202 sockinfo(lsa, &local);
203 sockinfo(fsa, &foreign);
205 if (tcpswitch_list_commands) {
206 printf("switch_tls %s %s %s %s %s\n",
207 mode == SW_TLS ? "-s" : "-i",
208 local.hs_host, local.hs_service,
209 foreign.hs_host, foreign.hs_service);
213 rv = sysctlbyname(mode == SW_TLS ? "net.inet.tcp.switch_to_sw_tls" :
214 "net.inet.tcp.switch_to_ifnet_tls", NULL, NULL, &addrs,
217 warn("%s %s %s %s", local.hs_host, local.hs_service,
218 foreign.hs_host, foreign.hs_service);
221 printf("%s %s %s %s: switched\n", local.hs_host, local.hs_service,
222 foreign.hs_host, foreign.hs_service);
227 tcpswitchall(const char *stack, int mode)
229 struct xinpgen *head, *xinp;
236 head = getxpcblist("net.inet.tcp.pcblist");
238 #define XINP_NEXT(xinp) \
239 ((struct xinpgen *)(uintptr_t)((uintptr_t)(xinp) + (xinp)->xig_len))
241 for (xinp = XINP_NEXT(head); xinp->xig_len > sizeof *xinp;
242 xinp = XINP_NEXT(xinp)) {
243 xtp = (struct xtcpcb *)xinp;
248 * Check protocol, support just v4 or v6, etc.
251 /* Ignore PCBs which were freed during copyout. */
252 if (xip->inp_gencnt > head->xig_gen)
255 /* Skip listening sockets. */
256 if (xtp->t_state == TCPS_LISTEN)
259 /* If requested, skip sockets not having the requested stack. */
260 if (stack[0] != '\0' &&
261 strncmp(xtp->xt_stack, stack, TCP_FUNCTION_NAME_LEN_MAX))
264 if (!tcpswitchconn(&xip->inp_inc, mode))
273 tcpswitchbyname(const char *lhost, const char *lport, const char *fhost,
274 const char *fport, int mode)
276 static const struct addrinfo hints = {
278 * Look for streams in all domains.
280 .ai_family = AF_UNSPEC,
281 .ai_socktype = SOCK_STREAM,
283 struct addrinfo *ail, *local, *aif, *foreign;
287 error = getaddrinfo(lhost, lport, &hints, &local);
289 errx(1, "getaddrinfo: %s port %s: %s", lhost, lport,
290 gai_strerror(error));
292 error = getaddrinfo(fhost, fport, &hints, &foreign);
294 freeaddrinfo(local); /* XXX gratuitous */
295 errx(1, "getaddrinfo: %s port %s: %s", fhost, fport,
296 gai_strerror(error));
303 * Try every combination of local and foreign address pairs.
305 for (ail = local; ail != NULL; ail = ail->ai_next) {
306 for (aif = foreign; aif != NULL; aif = aif->ai_next) {
307 if (ail->ai_family != aif->ai_family)
310 if (!tcpswitch(ail->ai_addr, aif->ai_addr, mode))
316 warnx("%s %s %s %s: different address families", lhost, lport,
322 freeaddrinfo(foreign);
328 tcpswitchconn(const struct in_conninfo *inc, int mode)
330 struct sockaddr *local, *foreign;
331 struct sockaddr_in6 sin6[2];
332 struct sockaddr_in sin4[2];
334 if ((inc->inc_flags & INC_ISIPV6) != 0) {
335 memset(sin6, 0, sizeof sin6);
337 sin6[TCPDROP_LOCAL].sin6_len = sizeof sin6[TCPDROP_LOCAL];
338 sin6[TCPDROP_LOCAL].sin6_family = AF_INET6;
339 sin6[TCPDROP_LOCAL].sin6_port = inc->inc_lport;
340 memcpy(&sin6[TCPDROP_LOCAL].sin6_addr, &inc->inc6_laddr,
341 sizeof inc->inc6_laddr);
342 local = (struct sockaddr *)&sin6[TCPDROP_LOCAL];
344 sin6[TCPDROP_FOREIGN].sin6_len = sizeof sin6[TCPDROP_FOREIGN];
345 sin6[TCPDROP_FOREIGN].sin6_family = AF_INET6;
346 sin6[TCPDROP_FOREIGN].sin6_port = inc->inc_fport;
347 memcpy(&sin6[TCPDROP_FOREIGN].sin6_addr, &inc->inc6_faddr,
348 sizeof inc->inc6_faddr);
349 foreign = (struct sockaddr *)&sin6[TCPDROP_FOREIGN];
351 memset(sin4, 0, sizeof sin4);
353 sin4[TCPDROP_LOCAL].sin_len = sizeof sin4[TCPDROP_LOCAL];
354 sin4[TCPDROP_LOCAL].sin_family = AF_INET;
355 sin4[TCPDROP_LOCAL].sin_port = inc->inc_lport;
356 memcpy(&sin4[TCPDROP_LOCAL].sin_addr, &inc->inc_laddr,
357 sizeof inc->inc_laddr);
358 local = (struct sockaddr *)&sin4[TCPDROP_LOCAL];
360 sin4[TCPDROP_FOREIGN].sin_len = sizeof sin4[TCPDROP_FOREIGN];
361 sin4[TCPDROP_FOREIGN].sin_family = AF_INET;
362 sin4[TCPDROP_FOREIGN].sin_port = inc->inc_fport;
363 memcpy(&sin4[TCPDROP_FOREIGN].sin_addr, &inc->inc_faddr,
364 sizeof inc->inc_faddr);
365 foreign = (struct sockaddr *)&sin4[TCPDROP_FOREIGN];
368 return (tcpswitch(local, foreign, mode));
375 "usage: switch_tls [-i | -s] local-address local-port foreign-address foreign-port\n"
376 " switch_tls [-i | -s] local-address:local-port foreign-address:foreign-port\n"
377 " switch_tls [-i | -s] local-address.local-port foreign-address.foreign-port\n"
378 " switch_tls [-l | -i | -s] -a\n"
379 " switch_tls [-l | -i | -s] -S stack\n");